JP2023090195A - Floating type disc brake device - Google Patents

Abstract

To realize a floating type disc brake device that can prevent surface pressure between an outer body portion of a caliper body and an abutting portion of an outer pad from locally increasing in a diametrically outside portion of the outer pad.SOLUTION: A floating type disc brake device is equipped with an inner pad, an outer pad 5, a support, and a caliper body 3. A bulging portion 32 is provided on almost the entire part axially opposing to a substrate portion 49b of the outer pad 5 of an outer body portion 21 configuring the caliper body 3. On an axially inside surface of the bulging portion 32, an abutting projecting portion 33 is formed, in which an area of a part axially opposing to a diametrically inside half portion of the substrate portion 49b is larger than an area of a part axially opposing to a diametrically outside half portion of the substrate portion 49b. At braking, only tip end surface of the abutting projecting portion 33 abuts on the axially outside surface of the substrate portion 49b.SELECTED DRAWING: Figure 17

Description

The present invention relates to a floating disc brake device.

Disc brake systems are widely used for braking automobiles and motorcycles. During braking by the disc brake device, a piston presses a pair of pads arranged on both sides in the axial direction of a rotor that rotates with the wheel against both sides in the axial direction of the rotor. As such a disc brake device, various structures have been conventionally known. It has been widely used in the past because it is advantageous in terms of cost and cost reduction.

A floating type disc brake device consists of a support fixed to the vehicle body, a caliper body supported axially movably with respect to the support, and an inner pad and an outer pad supported axially movably with respect to the support. and The axial direction means the axial direction of the rotor unless otherwise specified.

The caliper body has a cylinder and includes an inner body portion arranged axially inside the rotor, and an outer body portion axially pressing the outer pad. A piston that axially presses the inner pad during braking is fitted inside a cylinder provided in the inner body portion.

When braking, pressure oil is fed from the master cylinder to the cylinder, and the piston presses the inner pad against the axial side surface of the rotor. Then, as a reaction to this pressing force, the caliper body moves axially inward with respect to the support. As a result, the outer body portion presses the outer pad against the axial side surface of the rotor. As a result, the rotor is strongly clamped from both sides in the axial direction by the inner pad and the outer pad, and braking is performed.

Japanese Utility Model Laid-Open No. 7-38771

A disc brake device having a structure in which an outer body portion that constitutes a caliper body directly presses an outer pad during braking has the following problems to be improved.

That is, the outer body portion has a cantilever beam structure that is connected to the inner body portion only at the radially outer portion. Therefore, as shown exaggeratedly in FIG. 25, the pad pressing portion 100a of the outer body portion 100 that presses the outer pad 101 is elastically deformed to be lifted axially outward and radially outward during braking. . Therefore, the amount of elastic deformation of the pad pressing portion 100a is greater at the radially inner portion than at the radially outer portion. Therefore, when adopting a structure in which the pad pressing portion of the outer body portion is brought into full contact with the outer pad, the surface pressure of the contact portion between the outer body portion and the outer pad is localized at the radially outer portion (peripheral edge portion) of the outer pad. can be higher. As a result, uneven wear may occur in the outer pad, and squealing may occur during braking.

SUMMARY OF THE INVENTION The present invention is made to solve the above-described problems, and prevents the surface pressure of the contact portion between the outer body portion of the caliper body and the outer pad from locally increasing at the radially outer portion of the outer pad. To provide a floating type disc brake device capable of

A floating type disc brake device according to one aspect of the present invention includes an inner pad, an outer pad, a support, and a caliper body.
The inner pad is arranged axially inside the rotor.
The outer pad is arranged axially outside of the rotor.
The support is fixed to the vehicle body and axially movably supports the inner pad and the outer pad.
The caliper body is supported axially movably with respect to the support.
The outer pad has a protruding portion protruding axially inward over substantially the entire portion axially facing the substrate portion.
The projecting portion has a radially inner half portion of the substrate portion axially larger than the area of the portion axially facing the radially outer half portion of the substrate portion on the axial inner surface (tip surface). It has an axially protruding contact projection, the area of which is larger than that of the opposing portion.
During braking, the outer body portion causes only the tip surface of the contact protrusion to abut against the axial outer side surface (back surface) of the base plate portion.

In the floating-type disc brake device according to one aspect of the present invention, the outer body portion is arranged on both circumferentially outer sides of the projecting portion so as to be axially outward of the support when wear of the inner pad and the outer pad progresses. It may have a pair of relief recesses recessed toward the outside in the axial direction for entry of the part.

In the floating type disc brake device according to one aspect of the present invention, the axial height of the contact protrusion can be made constant.

In the floating type disc brake device according to the aspect of the present invention, the contact protrusion may have a strip-shaped radial protrusion extending in the radial direction.
In this case, the radial projection can be arranged on or near the central axis of the cylinder.

In the floating type disc brake device according to one aspect of the present invention, a plurality of the radial protrusions may be provided in a manner separated from each other in the circumferential direction, and the plurality of radial protrusions may be arranged parallel to each other. .

In the floating type disc brake device according to one aspect of the present invention, the protruding portion is formed on the outer peripheral edge portion of the axial inner side surface that is radially outward from the portion axially facing the substrate portion, A reinforcing rib may be provided, and the radially outer end of the radial projection may be connected to the reinforcing rib.

In the floating type disc brake device according to one aspect of the present invention, the contact protrusion may have a strip-shaped circumferential protrusion extending in the circumferential direction.
In this case, the circumferential convex portion can be arranged so as to intersect the radial convex portion.

In the floating type disc brake device according to one aspect of the present invention, a plurality of the circumferential projections can be provided so as to be separated from each other in the radial direction.

In the floating type disc brake device according to the aspect of the present invention, the circumferential projection can be arranged at a radial position that intersects with the central axis of the cylinder.
And/or, the circumferential projection can be arranged at a position radially inwardly deviated from the central axis of the cylinder.

In the floating type disc brake device according to one aspect of the present invention, the circumferential convex portion may be curved so as to protrude radially outward.
In the floating type disc brake device according to one aspect of the present invention, the circumferential convex portion may extend linearly in the circumferential direction.

In the floating type disc brake device according to one aspect of the present invention, the circumferential dimension of the outer body portion can be made larger than the circumferential dimension of the support.

According to the present invention, it is possible to realize a floating disc brake device that can prevent the surface pressure of the contact portion between the outer body portion of the caliper body and the outer pad from locally increasing at the radially outer portion of the outer pad.

FIG. 1 is a front view of a disc brake device according to a first embodiment, viewed from the outside in the axial direction. FIG. 2 is a rear view of the disc brake device according to the first embodiment, viewed from the inner side in the axial direction. FIG. 3 is a plan view of the disc brake device according to the first embodiment as seen from the radially outer side. FIG. 4 is a bottom view of the disc brake device according to the first embodiment as seen from the radially inner side. FIG. 5 is a side view of the disc brake device according to the first embodiment as viewed from the right side of FIG. 1. FIG. FIG. 6 is a perspective view of the disc brake device according to the first embodiment, viewed from the axially outer side and the radially outer side. FIG. 7 is a perspective view of the disc brake device according to the first embodiment as seen from the axially inner side and the radially outer side. FIG. 8 is a perspective view of the disc brake device according to the first embodiment, viewed from the axially outer side and the radially inner side. FIG. 9 is a perspective view of the disc brake device according to the first embodiment, viewed from the inner side in the axial direction and the inner side in the radial direction. FIG. 10 is a perspective view of the disc brake device according to the first embodiment with the caliper body taken out and viewed from the outside in the axial direction and the outside in the radial direction. FIG. 11 is a perspective view of the disc brake device according to the first embodiment, with the caliper body taken out and viewed from the axially inner side and the radially outer side. FIG. 12 is a perspective view of the disc brake device according to the first embodiment, with the caliper body taken out and viewed from the axially outer side and the radially inner side. FIG. 13 is a perspective view of a caliper body taken out from the disc brake device according to the first embodiment and viewed from the inner side in the axial direction and the inner side in the radial direction. FIG. 14 is a view of the outer body portion of the caliper body taken out from the disc brake device according to the first example of the embodiment and viewed from the outside in the axial direction. FIG. 15 is a view of the outer body portion of the caliper body taken out from the disc brake device according to the first example of the embodiment and viewed from the inner side in the axial direction. FIG. 16 is a view of the outer body portion of the caliper body and the outer pad taken out from the disc brake device according to the first example of the embodiment and viewed from the inner side in the axial direction. FIG. 17 is a partial perspective view of the disc brake device according to the first embodiment, with the outer body portion of the caliper body and the outer pad taken out and viewed from the inner side in the axial direction. FIG. 18 is a view of the disk brake device according to the first embodiment, with the support and pad clips taken out and viewed from the outside in the axial direction. 19 is a view seen from the right side of FIG. 18. FIG. FIG. 20 is a perspective view of the disc brake device according to the first embodiment, with the support and pad clips taken out and viewed from the outside in the axial direction and the outside in the radial direction. FIG. 21 is a partial perspective view of the assembled state of the inner pad and the outer pad to the support, viewed from the axially inner side and the radially outer side, regarding the first example of the embodiment. FIG. 22 is a diagram of an outer pad removed from the disc brake device according to the first embodiment and viewed from the outside in the axial direction. FIG. 23 is a diagram corresponding to FIG. 15, showing a second example of the embodiment. FIG. 24 is a diagram corresponding to FIG. 15, showing a third example of the embodiment. FIG. 25 is a schematic diagram of the caliper body viewed from the outside in the circumferential direction, for explaining the problems of the conventional structure.

[First example of embodiment]
A first example of the embodiment will be described with reference to FIGS. 1 to 22. FIG.
Unless otherwise specified, the terms "axial direction", "radial direction", and "circumferential direction" throughout this specification and claims refer to the axial direction and radial direction of a disk-shaped rotor that rotates with the wheel. and circumferential direction. Further, when the disc brake device is attached to the vehicle body, the widthwise outer side of the vehicle body is referred to as the axially outer side, and the widthwise central side of the vehicle body is referred to as the axially inner side. Also, the circumferential center side of the disc brake device is referred to as the circumferential inner side, and both sides of the disc brake device in the circumferential direction are referred to as the circumferential outer side. Further, the "incoming side" means the side where the rotor enters the caliper body, and the "outgoing side" means the side where the rotor exits the caliper body.

[Description of the structure of the disc brake device]
A disc brake device 1 of this example is a floating type disc brake device and includes a support 2 , a caliper body 3 , an inner pad 4 and an outer pad 5 .

<support>
The support 2 is a casting made of a ferrous alloy such as cast iron, and is fixed to the vehicle body. The support 2 axially movably supports the caliper body 3 and axially movably supports the inner pad 4 and the outer pad 5 .

As shown in FIGS. 18 to 20, the support 2 includes a pair of guides 9 arranged at both outer ends in the circumferential direction, and a rotor 8 (not shown in FIGS. 18 to 20, see FIG. 3). The rotor 8 has an inner side circumferential connecting portion 10 arranged axially inside the rotor 8 and extending in the circumferential direction, and an outer side circumferential connecting portion 11 arranged axially outside the rotor 8 and extending in the circumferential direction. The support 2 is fixed to a suspension system that constitutes the vehicle body using a pair of mounting holes 12 provided at both circumferentially outer ends of the inner side circumferential connecting portion 10 . Note that the outer side circumferential connecting portion 11 can be omitted from the support 2 when implementing the present invention.

Each of the pair of guide portions 9 has an inverted U shape when viewed in the circumferential direction, and is arranged so as to straddle the rotor 8 from the outside in the radial direction. Each of the pair of guide portions 9 includes an inner guide portion 13 for axially movably supporting the inner pad 4 and an outer guide portion 14 for axially movably supporting the outer pad 5. A caliper guide portion 15 is provided, which axially connects the radially outer ends of the inner guide portion 13 and the outer guide portion 14 .

The inner guide portion 13 is arranged axially inward of the rotor 8 and extends radially. A radially inner end of the inner guide portion 13 is connected to a circumferentially outer end of the inner side circumferential connecting portion 10 . The inner guide portion 13 has an inner side guide groove 16 recessed outward in the circumferential direction on the radially inner portion of the inner side surface in the circumferential direction. The inner-side guide recessed groove 16 can be engaged with a later-described ear portion 50a provided on the inner pad 4 .

The outer guide portion 14 is arranged axially outside the rotor 8 and extends radially. A radially inner end portion of the outer guide portion 14 is connected to a circumferentially outer end portion of the outer side circumferential connecting portion 11 . The outer guide portion 14 has an outer guide recessed groove 17 recessed outward in the circumferential direction on the radially inner portion of the inner circumferential surface. The outer-side guide recessed groove 17 can be engaged with an ear portion 50b provided on the outer pad 5, which will be described later. As shown in FIG. 19 , the axial outer surface of the outer guide portion 14 protrudes axially outward beyond the axial outer surface of the outer-side circumferential connecting portion 11 .

The caliper guide portion 15 is arranged radially outside the rotor 8 and extends in the axial direction. A support hole 18 extending in the axial direction is formed inside the caliper guide portion 15 . The support hole 18 opens on the inner side surface of the caliper guide portion 15 in the axial direction. A front half of a slide pin 19 to be described later is slidably inserted into the support hole 18 . An axially inner end portion of the caliper guide portion 15 is arranged to protrude further inwardly in the axial direction than the inner guide portion 13 .

<Caliper body>
The caliper body 3 is axially movably supported with respect to the support 2 using a pair of slide pins 19 .

The caliper body 3 of this example has a split structure rather than an integral structure. That is, as shown in FIGS. 10 to 13, the caliper body 3 includes an inner body portion 20 and an outer body portion 21 which are constructed separately from each other. , 22b. The plurality of connecting members 22a and 22b are spaced apart in the circumferential direction. Among the plurality of connecting members 22a and 22b, a pair of connecting members 22a arranged on both outer sides in the circumferential direction axially connect the ends of the inner body portion 20 and the outer body portion 21 on both outer sides in the circumferential direction. The remaining connecting member 22b connects the circumferentially inner (center-side) portions of the inner body portion 20 and the outer body portion 21 in the axial direction. In addition, when carrying out the present invention, the number of connecting members is not particularly limited. Also, when implementing the present invention, the caliper body may be of unitary construction.

The inner body portion 20 and the outer body portion 21 can be made of different materials or can be made of the same material. In this example, both the inner body portion 20 and the outer body portion 21 are made of an aluminum-based alloy, but they can also be made of an iron-based alloy or other materials. Furthermore, one of the inner body portion 20 and the outer body portion 21 can be made of an aluminum alloy, and the other of the inner body portion 20 and the outer body portion 21 can be made of a ferrous alloy or other material.

《Inner body part》
The inner body portion 20 is arranged axially inward of the rotor 8 . The inner body portion 20 has a pair of cylinders 23 , a pair of circumferential arm portions 24 , a pair of radial projecting portions 25 and belt-like ribs 27 . When carrying out the present invention, the number of cylinders provided in the inner body portion is not particularly limited, and may be one, or may be three or more.

A pair of cylinders 23 are provided at a circumferential inner portion (intermediate portion) of the inner body portion 20 . The pair of cylinders 23 are arranged side by side in the circumferential direction with their central axes O parallel to the central axis of the rotor 8 . The cylinder 23 has a substantially cylindrical shape and opens only axially outward. A piston (not shown) is fitted inside the cylinder 23 so as to be axially movable.

A pair of circumferential arm portions 24 are provided on both circumferentially outer portions of the inner body portion 20 . The pair of circumferential arm portions 24 are arranged on both outer sides of the pair of cylinders 23 in the circumferential direction. The circumferential arm portion 24 extends outward in the circumferential direction from the outer peripheral surface of the cylinder 23 .

The circumferential arm portion 24 has an insertion hole for axially inserting the connecting member 22a at its circumferentially outer end (tip), and has a slide pin 19 at its circumferentially intermediate portion. It has a fixing hole 26 for fixing the proximal end. The circumferentially outer end of the circumferential arm 24 is offset axially outwardly relative to the circumferentially inner end or intermediate portion of the circumferential arm 24 . Therefore, the circumferential arm portion 24 has a substantially L shape when viewed in the radial direction. The axially outer surface of the circumferentially outer end of the circumferential arm portion 24 is a flat surface.

The pair of radial projecting portions 25 are arranged in the circumferentially inner portion (intermediate portion) of the inner body portion 20 while being separated from each other in the circumferential direction. The pair of radial projecting portions 25 are arranged radially outward of the axially outer portions of the pair of cylinders 23 . The radial projecting portion 25 has a flat plate shape and extends radially outward from the outer peripheral surface of the cylinder 23 . The radial projecting portion 25 has an insertion hole for axially inserting the connecting member 22b. The axially outer surface of the radial projecting portion 25 is a flat surface and is positioned on the same imaginary plane as the axially outer surface of the circumferentially outer end portion of the circumferential arm portion 24 .

The band-shaped rib 27 is a thick portion (protruded axially inward) that is thicker than other portions, and is provided on the inner side surface of the inner body portion 20 in the axial direction. Therefore, the inner body portion 20 has an increased thickness and improved rigidity at the portion where the strip-shaped rib 27 is provided.

The strip-shaped rib 27 extends in the circumferential direction and covers the bottom portions 23a of the pair of cylinders 23 from the inner side in the axial direction so as to traverse in the circumferential direction. Both circumferentially outer ends of the strip-shaped rib 27 extend circumferentially outwardly from the bottom portion 23a of the cylinder 23 and are positioned at circumferentially outer ends of the axially inner surface of the inner body portion 20. . For this reason, the belt-like rib 27 is provided over substantially the entire circumferential length of the inner side surface in the axial direction of the inner body portion 20 .

《Outer body part》
The outer body portion 21 includes a substantially bow-shaped axial cover portion 28 arranged axially outside the outer pad 5 and a partially cylindrical radial cover portion 29 arranged radially outside the rotor 8 . have. The outer body portion 21 has a substantially L-shaped cross-sectional shape with respect to an imaginary plane including the central axis of the rotor 8 . The axial direction covering portion 28 and the radial direction covering portion 29 are configured integrally.

The axial direction covering portion 28 is configured in a substantially arcuate flat plate shape, and directly presses the outer pad 5 in the axial direction during braking. The axial cover portion 28 is a portion that can be visually recognized from the outside when the disc brake device 1 is attached to the vehicle body, and the design surface is formed by the axial outer surface.

In this example, the circumferential dimension of the axial direction covering portion 28 is made larger than the circumferential dimension of the support 2 , and both circumferential direction outer portions of the axial direction covering portion 28 are positioned further outward than the pair of guide portions 9 in the circumferential direction. is made to protrude. The axial covering portion 28 covers the pair of guide portions 9 from the outside in the axial direction. In other words, the pair of guide portions 9 are made invisible from the outside. In the case of this example, by making the circumferential dimension of the axial cover portion 28 larger than the circumferential dimension of the support 2, the design surface formed by the axial outer surface of the axial cover portion 28 can be obtained. is largely ensured.

In this example, the circumferential dimension of the axial covering portion 28 is larger than the circumferential dimensions of each of the radial covering portion 29 and the inner body portion 20 . For this reason, substantially triangular plate-shaped wing portions 30 are provided at both circumferentially outer ends of the axial direction covering portion 28 and project outwardly in the circumferential direction from the radial direction covering portion 29 and the inner body portion 20 . .

As shown in FIG. 15, the axial covering portion 28 has a flat reference surface 31 on its axially inner side surface. The axial covering portion 28 has a protruding portion 32 protruding axially inward from the reference surface 31 on the inner circumferential portion of the axial inner surface. As shown in FIG. 17, the projecting portion 32 is provided on substantially the entire portion of the axial inner surface of the axial cover portion 28 that axially faces a later-described substrate portion 49b that constitutes the outer pad 5. As shown in FIG. ing. Therefore, the projecting portion 32 has a shape that substantially matches the substrate portion 49 b of the outer pad 5 .

A contact projection (rib) 33 that protrudes axially inward is provided on the axially inner side surface (tip surface) of the projecting portion 32 . In this example, only the contact protrusion 33 of the outer body portion 21 contacts the axial outer surface (back surface) of the substrate portion 49b of the outer pad 5 during braking.

In this example, the axial height of the contact projection 33 from the reference surface 31 (the amount of protrusion from the reference surface 31) is constant, for example, about several millimeters. However, when carrying out the present invention, the axial height of the contact protrusion can also be changed according to the radial position and/or the circumferential position of the contact protrusion. Further, the tip surface of the contact convex portion 33 is made into a smooth surface (machined surface) by machining. The reason for this is that the tip surface of the contact projection 33 can uniformly contact the contact surface 54 (see FIG. 22) of the substrate portion 49b of the outer pad 5, and the contact becomes uneven. This is to prevent the pressing force on the outer pad 5 from becoming unstable and causing brake squeal. In addition, the processing time can be shortened as compared with the case where the axial inner side surface of the overhanging portion 32 is brought into full contact with the substrate portion 49b of the outer pad 5 without providing the contact convex portion 33. .

The contact convex portion 33 has a larger area of the portion axially facing the radially inner half portion of the substrate portion 49b than the area of the portion axially facing the radially outer half portion of the substrate portion 49b. It has a shape For this reason, in this example, the shape of the contact protrusion 33 is formed into a substantially lattice shape by combining a plurality of radial protrusions 34a, 34b and a plurality of circumferential protrusions 35a, 35b. As a result, the area of the tip surface of the abutting projection 33 is set to the radially outer side of the imaginary circle C passing through the central axis O of each of the two cylinders 23 and centered on the central axis of the rotor 8 . The portion existing in the radial direction is made larger than the portion existing in the radial direction.

The contact protrusion 33 has two radial protrusions 34a and 34b. Each of the radial projections 34a and 34b extends linearly in the radial direction and has a strip shape. The width dimension of the radial protrusions 34a, 34b is constant over the entire length of the radial protrusions 34a, 34b. The two radial protrusions 34a and 34b are arranged parallel to each other while being spaced apart in the circumferential direction, and are arranged in the vicinity of the center axis O of each cylinder 23 in the circumferential direction. In addition, when carrying out the present invention, one or more radial protrusions can be provided, and the width dimension of the radial protrusions can be varied according to the radial position.

The contact protrusion 33 has two circumferential protrusions 35a and 35b. Each of the circumferential projections 35a and 35b extends in the circumferential direction and has a strip shape. In addition, when carrying out the present invention, it is also possible to provide one or three or more circumferential projections.

Of the two circumferential projections 35a and 35b, the circumferential projection 35a arranged on the radially outer side has an arcuate shape that is curved so that the radially outer side is convex, and the width dimension is the full length. constant over The circumferential projection 35a is arranged at a radially intermediate portion of the axial inner surface of the projecting portion 32, and intersects the radially intermediate portions of the two radially projecting portions 34a and 34b. In other words, the circumferential projection 35a circumferentially crosses the radial intermediate portions of the two radial projections 34a and 34b. In addition, the circumferential projections 35 a are arranged at radial positions that intersect the central axis O of each cylinder 23 . Therefore, the circumferential convex portion 35a is arranged on the virtual circle C. As shown in FIG. Both circumferentially outer ends of the circumferential projection 35a do not reach the circumferentially outer ends of the axial inner surfaces of the projecting portions 32 .

Of the two circumferential projections 35a and 35b, the radially inner circumferential projection 35b has a linear shape, and the width dimension differs depending on the circumferential position. The circumferential convex portion 35b is arranged at the inner peripheral edge portion (the radially inner end portion) of the axial inner surface of the protruding portion 32, which is located radially inward from the central axis O of each cylinder 23. . The circumferential projection 35b is connected to the radially inner ends of the two radial projections 34a and 34b. In addition, the width dimensions of both circumferentially outer ends of the circumferentially projected portion 35b, which are circumferentially outward of the radially projected portions 34a, 34b, are circumferentially more inwardly than the radially projected portions 34a, 34b. It is larger than the width dimension of the inner circumferential portion. Both circumferentially outer end portions of the circumferentially projected portion 35b are located circumferentially inwardly of the circumferentially both outermost end portions of the circumferentially projected portion 35a, It does not reach the outer end in the direction.

In this example, of the two circumferential projections 35 a and 35 b that constitute the contact projection 33 , the radially outer circumferential projection 35 a is the radially intermediate portion of the axially inner side surface of the projecting portion 32 . , and the radially inner circumferential convex portion 35b is arranged on the inner peripheral edge of the axially inner side surface of the projecting portion 32 . As a result, the area of the tip surface of the abutting convex portion 33 is larger than the portion existing radially outward across the virtual circle C by approximately the area of the tip surface of the radially inner circumferential convex portion 35b. It is large in the part existing in the direction inside.

The protruding portion 32 has a reinforcing rib 36 on the outer peripheral edge portion of the axial inner side surface of the axial cover portion 28, which is radially outward from the portion facing the substrate portion 49b of the outer pad 5 in the axial direction. are doing. The reinforcing rib 36 reinforces the space between the outer peripheral edge portion of the axial inner surface of the axial covering portion 28 and the axially outer end portion of the radial inner surface of the radial covering portion 29 .

The reinforcing rib 36 extends in the circumferential direction and has a strip shape. The reinforcing rib 36 has an arc shape that is curved so that the radially outer side is convex, and the width dimension is constant over the entire length. Both circumferentially outer ends of the reinforcing ribs 36 reach the circumferentially outer ends of the axially inner surface of the protruding portion 32 . The radially outer end portions of the two radial protrusions 34 a and 34 b forming the contact protrusion 33 are connected to the circumferential intermediate portion of the reinforcing rib 36 . Since the reinforcing rib 36 is provided at a position radially outwardly deviated from the portion of the outer pad 5 axially facing the substrate portion 49b, it does not come into contact with the axially outer side surface of the substrate portion 49b even during braking. do not have.

In this example, by forming the contact convex portion 33 on the axial inner side surface of the overhanging portion 32, a reinforcing rib 36 and a circumferential convex portion 35a are formed on the axial inner surface of the overhanging portion 32 to form a pair of radially extending portions. A substantially rectangular non-contact portion 53a surrounded on all sides by the directional protrusions 34a and 34b is formed, and a pair of circumferential protrusions 35a and 35b and a pair of radial protrusions 34a and 34b form a non-contact portion 53a. A substantially rectangular non-contact portion 53b surrounded on four sides is formed. In other words, two non-contact portions 53 a and 53 b are formed inside the contact protrusion 33 .

The axial covering portion 28 has a pair of relief recesses 37 recessed axially outward from the reference surface 31 on both circumferentially outer portions of the projecting portion 32 of the axial inner surface. The escape recess 37 is provided in a portion of the axial inner side surface of the axial cover portion 28 that axially faces the pair of outer guide portions 14 that constitute the support 2 and the vicinity thereof. Specifically, the relief recesses 37 are provided in a portion axially facing the outer guide portion 14 and a portion axially facing a portion located near the inner side of the outer guide portion 14 in the circumferential direction. .

Each of the relief recesses 37 has a deep recess 37a on the inner side in the circumferential direction, and a shallow recess 37b having a shallower axial depth than the deep recess 37a on the outer side in the circumferential direction of the deep recess 37a.

Wear of the inner pad 4 and the outer pad 5 progresses inside the escape recess 37 , and when the caliper body 3 moves axially inward with respect to the support 2 , the axially outer portion of the outer guide portion 14 and The axially outer portions of the pad clips 7a and 7b attached to the circumferential inner surface of the outer guide portion 14 can enter. Specifically, the axially outer portion of the outer guide portion 14 can be inserted into the shallow recess 37b, and the axially outer portions of the pad clips 7a and 7b can be inserted into the deep recess 37a. be able to. With such a configuration, interference between the pair of outer guide portions 14 and pad clips 7a and 7b and the outer body portion 21 is prevented.

The axial covering portion 28 has through holes 38 into which the axially outer ends of the pad clips 7a and 7b can be inserted. As will be described later, the pad clips 7a and 7b used in this example have a configuration in which the curled portion 52 protrudes significantly outward in the axial direction compared to the other portions of the pad clips 7a and 7b. Therefore, in this example, in order to prevent interference between the bottom surface of the deep recess 37a and the curled portion 52, the axial covering portion 28 is formed with a through hole 38 into which only the curled portion 52 can be inserted. This suppresses a decrease in rigidity of the outer body portion 21 compared to the case where the axial depth of the entire deep recess 37a is increased.

The through hole 38 is open only to the axially outer side surface and the axially inner side surface of the axial cover portion 28, and is not open to other portions (for example, the radial cover portion 29). The through hole 38 is formed in a portion of the axial covering portion 28 that axially faces the inner space of the outer side guide groove 17 located near the inner side of the outer guide portion 14 in the circumferential direction.

The axial covering portion 28 has a first recessed groove 39 on its axially outer surface, which communicates with the axially outer opening of the through hole 38 . Each of the first grooves 39 extends in the circumferential direction, and the inner end in the circumferential direction is connected to the outer opening in the axial direction of the through hole 38 . For this reason, the axial covering portion 28 has two first grooves 39 .

The width dimension of the first groove 39 is substantially constant over the entire length of the first groove 39 and substantially the same as the radial dimension of the axially outer opening of the through hole 38 . In this example, a first recessed groove 39 is provided so as to be connected to the axially outer opening of the through hole 38 , and the width dimension of the first recessed groove 39 is set to the axially outer opening of the through hole 38 . It is assumed to be almost the same as the radial dimension in Therefore, the through hole 38 and the first concave groove 39 can be smoothly connected, and the axial outer opening of the through hole 38 can be made inconspicuous from the outside. In addition, designability can be enhanced by incorporating the axial outer opening of the through hole 38 as part of the design of the design surface.

The axial covering portion 28 has a second recessed groove 40 that connects the axially outer openings of the through-holes 38 on its axially outer surface. The second groove 40 extends in the circumferential direction and is curved so that the radially outer side is convex. The width dimension of the second groove 40 is substantially constant over the entire length of the second groove 40 and substantially the same as the radial dimension of the axially outer opening of the through hole 38 . Therefore, the pair of first grooves 39 arranged on both outer sides in the circumferential direction are smoothly continuous in the circumferential direction via the pair of through holes 38 and the second grooves 40 .

The axial covering portion 28 has an annular fan-shaped display portion 41 that can be used to display a logo or the like in the circumferentially intermediate portion of the axial outer surface. The display portion 41 has a flat surface shape and is arranged radially outside the pair of through holes 38 and the second groove 40 . In this example, since the circumferential dimension of the axial covering portion 28 is larger than the circumferential dimension of the support 2, the circumferential dimension of the display portion 41 can also be sufficiently increased. Since the display portion 41 is surrounded by the groove portions 42 on both the outer sides in the circumferential direction and the outer side in the radial direction, the display portion 41 is visually recognized as floating outward in the axial direction.

The radial covering portion 29 has a partially cylindrical shape and extends axially inward from the outer peripheral edge portion of the axial covering portion 28 . The radial direction covering portion 29 covers the pair of guide portions 9 constituting the support 2, a portion of the rotor 8 in the circumferential direction, and both the inner and outer pads 4 and 5 from the radial outside. The circumferential dimension of the radial cover portion 29 is the same as the circumferential dimension of the inner body portion 20 .

The radial covering portion 29 has mounting holes (screw holes) 43 for fixing the distal end portions of the connecting members 22a and 22b at a plurality of locations (four locations in the illustrated example) in the circumferential direction. The plurality of mounting holes 43 are arranged at the same pitch in the circumferential direction as the plurality of insertion holes provided in the inner body portion 20 . The mounting hole 43 opens to the axial inner surface of the radial cover portion 29 .

The radial covering portion 29 has central windows 44 which are open on both sides in the radial direction at the axial inner portion of the circumferential central portion. The central window 44 has an axially elongated slit shape. The central window 44 also opens to the axial inner surface of the radial cover portion 29 . The central window 44 can be used to visually confirm the state of wear of the inner pad 4 and the outer pad 5 .

The outer body portion 21 including the axial cover portion 28 and the radial cover portion 29 is fixed to the axially outer side of the inner body portion 20 using connecting members 22a and 22b, respectively, which are bolts. Specifically, the distal end portion of the connecting member 22a axially inserted through the insertion hole provided in the circumferential arm portion 24 of the inner body portion 20 is attached to the radially outer portion of the radial covering portion 29 of the outer body portion 21. The distal end portion of the connecting member 22b screwed into the provided mounting hole 43 and axially inserted through the insertion hole provided in the radial projecting portion 25 of the inner body portion 20 is inserted into the outer body portion 21 in the radial direction. It is screwed into a mounting hole 43 provided on the circumferential inner side of the cover portion 29 . As a result, the outer body portion 21 is connected to the axially outer side of the inner body portion 20 using the connecting members 22a and 22b. Therefore, the outer body portion 21 has a cantilever structure that is connected to the inner body portion 20 only at the radially outer portion.

A pair of openings 45 are formed between the axially outer side surface of the inner body section 20 and the axially inner side surface of the outer body section 21 in a state where the inner body section 20 and the outer body section 21 are connected. The pair of openings 45 are separated from each other in the circumferential direction and arranged on both outer sides in the circumferential direction of the pair of radial projections 25 . Each of the openings 45 has a substantially rectangular shape when viewed in the radial direction. In the assembled state of the disc brake device 1 , the axially inner portion of the caliper guide portion 15 that constitutes the support 2 is exposed through the opening portion 45 .

The caliper body 3 is supported by the support 2 so as to be movable in the axial direction. For this purpose, the proximal end portion of the slide pin 19 is fixed to the fixing hole 26 provided in the circumferential intermediate portion of the circumferential arm portion 24 that constitutes the inner body portion 20, and the front half portion of the slide pin 19 is It is inserted inside a support hole 18 formed in a caliper guide portion 15 that constitutes the support 2 so that relative displacement (sliding) in the axial direction is possible. A boot 46 covers a portion of the outer peripheral surface of the slide pin 19 located between the support hole 18 and the fixing hole 26 .

<Inner pad and outer pad>
As shown in FIG. 21, the inner pad 4 includes a lining 47a and a back plate 48a, and is supported between the pair of inner guide portions 13 constituting the support 2 so as to be movable in the axial direction. It is

The back plate 48a has a rectangular plate-shaped base portion 49a that supports the back surface (axial inner side surface) of the lining 47a, and convex ear portions 50a that protrude outward from the base portion 49a in the circumferential direction. are doing. The substrate portion 49a has a shape that substantially matches the lining 47a.

In order to axially movably support the inner pad 4 with respect to the pair of inner guide portions 13 , the ear portions 50 a constituting the inner pad 4 are inserted into the inner guide grooves 16 provided in the inner guide portions 13 . are engaged with each other.

The outer pad 5 includes a lining 47b and a back plate 48b, and is supported between the pair of outer guide portions 14 forming the support 2 so as to be movable in the axial direction.

The back plate 48b has a rectangular plate-shaped base portion 49b that supports the back surface of the lining 47b, and convex ear portions 50b that protrude outward from the base portion 49b in the circumferential direction. The substrate portion 49b has a shape that substantially matches the lining 47b.

In order to axially movably support the outer pad 5 with respect to the pair of outer guide portions 14 , the ear portions 50 b forming the outer pad 5 are aligned with the outer side guide grooves 17 provided in the outer guide portions 14 . are engaged with each other.

<Pad clip>
Pad clips 6a and 6b are interposed between the circumferentially outer side surfaces of the back plate 48a constituting the inner pad 4 and the circumferentially inner side surfaces of the pair of inner guide portions 13, respectively. Pad clips 7a and 7b are interposed between the circumferentially outer side surfaces of the back plate 48b constituting the outer pad 5 and the circumferentially inner side surfaces of the pair of outer guide portions 14, respectively. This enables smooth axial movement of the inner pad 4 and the outer pad 5 .

The pad clips 6a, 6b, 7a, and 7b are made by pressing a metal plate having elasticity and corrosion resistance, such as a stainless steel plate. As shown in FIG. 21, each of the pad clips 6a, 6b, 7a, and 7b has a return spring 51 that biases the inner pad 4 and the outer pad 5 away from the rotor 8 when the braking force is released. is installed.

Of the four pad clips 6a, 6b, 7a, 7b, a pair of pad clips 6a, 7a arranged on the inflow side (right side in FIG. 18) and on the outflow side (left side in FIG. 18) A pair of arranged pad clips 6b and 7b have shapes symmetrical with respect to the axial direction. Also, the pair of pad clips 6a and 6b arranged to face each other in the circumferential direction and the pair of pad clips 7a and 7b arranged to face each other in the circumferential direction each have a symmetrical shape with respect to the circumferential direction. there is

The pad clips 6a and 6b, which are arranged axially inward of the rotor 8, elastically press the inner pad 4 inward in the circumferential direction, and push the ears 50a constituting the inner pad 4 radially outward. and press elastically.

The pad clips 7a and 7b, which are arranged axially outside the rotor 8, elastically press the outer pad 5 inward in the circumferential direction, and push the ears 50b forming the outer pad 5 radially outward. Press elastically. Further, as shown in FIG. 19, when the pad clips 7a and 7b are attached to the inner side surface of the outer guide portion 14 in the circumferential direction, the axially outer portions of the pad clips 7a and 7b extend from the outer guide portion 14 in the axial direction. It is arranged so as to protrude outward. In particular, among the pad clips 7a and 7b, the curled portion 52 having a partially cylindrical shape for elastically pressing the ear portion 50b radially outward is more flexible than the other portions of the pad clips 7a and 7b. It protrudes greatly outward in the axial direction, and is arranged so as to protrude most outward in the axial direction from the outer guide portion 14 .

Therefore, when the wear of the inner pad 4 and the outer pad 5 progresses and the caliper body 3 moves inward in the axial direction with respect to the support 2, the curled portions 52 forming the pad clips 7a and 7b will be removed from the outer body portion during braking. 21 is likely to interfere with the axial cover portion 28 . In this example, a through hole 38 is provided in a portion of the axial covering portion 28 that axially faces the inner space of the outer guide groove 17 , and the curled portion 52 is inserted into the through hole 38 . Therefore, interference between the curled portion 52 and the axial cover portion 28 can be prevented.

[Description of the operation of the disc brake device]
In order to perform braking by the disc brake device 1 of this example, pressurized oil is sent from the master cylinder to the cylinder 23 of the caliper body 3 . As a result, the piston (not shown) is pushed outward in the axial direction. Then, the piston presses the inner pad 4 against the axial inner surface of the rotor 8 to move the caliper body 3 axially inward with respect to the support 2 . As a result, the contact protrusion 33 of the projecting portion 32 provided on the axial cover portion 28 forming the caliper body 3 is pressed against the back surface of the back plate 48b forming the outer pad 5 . As a result, the outer pad 5 is pressed against the axial outer surface of the rotor 8 . As a result, the rotor 8 is strongly clamped from both sides in the axial direction by the inner pad 4 and the outer pad 5, and braking is performed.

When the brake is released, pressure oil is discharged from the cylinder 23 of the caliper body 3 . As a result, the piston is pulled back (rolled back) toward the inner side (inward in the axial direction) of the cylinder 23 by the elastic restoring force of a piston seal (not shown) externally fitted to the piston, and the axial inner surfaces of the inner pad 4 and the rotor 8 are pulled back (rolled back). Ensure clearance between As a result, the caliper body 3 moves slightly outward in the axial direction with respect to the support 2, and a clearance is secured between the outer pad 5 and the axial outer surface of the rotor 8 as well.

According to the disc brake device 1 of the present embodiment as described above, the surface pressure of the contact portion between the outer body portion 21 of the caliper body 3 and the outer pad 5 is locally increased at the radially outer portion of the outer pad 5. can be prevented.

That is, in this example, the axial inner side surface (tip surface) of the overhanging portion 32 provided in the outer body portion 21 is not brought into full contact with the axial outer side surface of the substrate portion 49b of the outer pad 5, but is extended. Only the tip surface of the contact projection 33 formed on the axially inner side surface of the projecting portion 32 is brought into contact with the axially outer side surface of the base plate portion 49b. Moreover, in this example, by devising the shape and formation position of the contact convex portion 33, the area of the radially inner half of the substrate portion 49b is larger than the area of the portion axially facing the radially outer half of the substrate portion 49b. The area of the portion axially facing the portion is increased.

Therefore, even when the axial cover portion 28 of the outer body portion 21 is elastically deformed axially outward and radially outward during braking as shown in FIG. A sufficient contact area between the radially inner half portion of the axial outer surface of the substrate portion 49b can be ensured. Therefore, it is possible to prevent the surface pressure of the contact portion between the outer body portion 21 and the outer pad 5 from locally increasing at the radially outer portion of the outer pad 5 . As a result, uneven surface pressure of the outer pad 5 against the rotor 8 can be reduced, so uneven wear of the lining 47b of the outer pad 5 and squealing during braking can be suppressed.

Further, in this example, the radially extending radial projections 34a and 34b constituting the contact projections 33 are arranged in the vicinity of the center axis O of each cylinder 23 in the circumferential direction, and the contact projections 34a and 34b Circumferential projections 35a extending in the circumferential direction forming part 33 are arranged at radial positions intersecting central axes O of cylinders 23, respectively. Therefore, the surface pressure of the contact portion between the outer body portion 21 and the outer pad 5 can be sufficiently ensured at the intermediate portion in the radial direction of the outer pad 5 . Therefore, it is possible to increase the contact area between the rotor 8 and the lining 47b of the outer pad 5, so that the uneven surface pressure of the outer pad 5 against the rotor 8 can be reduced.

In addition, since the circumferentially extending circumferentially extending portion 35b constituting the contacting protrusion 33 is arranged on the inner peripheral edge portion of the axially inner side surface of the projecting portion 32, the contacting protrusion 33 is not provided. , it is possible to secure the surface pressure at the radially inner portion (inner peripheral edge portion) of the outer pad 5 where the surface pressure tends to be the lowest.

In addition, the bending rigidity of the axial covering portion 28 of the outer body portion 21 can be increased by the radially extending convex portions 34 a and 34 b that constitute the contact convex portion 33 . Therefore, it is possible to suppress elastic deformation of the axial covering portion 28 as shown in FIG. Therefore, from this aspect as well, it is possible to prevent the surface pressure of the contact portion between the outer body portion 21 and the outer pad 5 from locally increasing at the radially outer portion of the outer pad 5 .

In this example, in the outer body portion 21, the space between the outer peripheral edge portion of the axial inner surface of the axial cover portion 28 and the axially outer end portion of the radial inner surface of the radial cover portion 29 is It is reinforced by reinforcing ribs 36 . Therefore, the reinforcing ribs 36 can also prevent the axial covering portion 28 from elastically deforming as shown in FIG. Furthermore, since the reinforcing ribs 36 are connected to the radially outer ends of the radial projections 34a and 34b, the rigidity is improved compared to the case where the reinforcing ribs 36 and the radial projections 34 are not connected. can be enhanced. Therefore, from this aspect as well, it is possible to prevent the surface pressure of the contact portion between the outer body portion 21 and the outer pad 5 from locally increasing at the radially outer portion of the outer pad 5 .

[Second example of embodiment]
A second example of the embodiment will be described with reference to FIG.

In this example, only the shape of the contact protrusion 33a provided on the axially inner side surface of the projecting portion 32 of the outer body portion 21 is changed from the structure of the first example of the embodiment.

That is, in this example, the contact protrusion 33a is composed of three radial protrusions 34a, 34b, 34c and two circumferential protrusions 35a, 35b. That is, the contact convex portion 33a has a configuration in which one band-shaped radial direction convex portion 34c extending in the radial direction is added to the contact convex portion 33 of the structure of the first example of the embodiment. The radial projection 34c is arranged in the circumferential center of the axial inner surface of the projecting portion 32, and is arranged parallel to the remaining two radial projections 34a and 34b. In this example, four substantially rectangular non-contact portions 53c, 53d, 53e, and 53f are formed inside the contact convex portion 33b.

In this example having the configuration as described above, the contact convex portion 33a has one more radial convex portion 34a extending in the radial direction than the structure of the first example of the embodiment. The bending rigidity of the axial cover portion 28 of the outer body portion 21 can be further increased. Therefore, the amount of elastic deformation of the axial cover portion 28 can be reduced, and the surface pressure of the contact portion between the outer body portion 21 and the outer pad 5 can be prevented from locally increasing at the radially outer portion of the outer pad 5 . can be prevented more effectively.
Other configurations and effects are the same as those of the first embodiment.

[Third example of embodiment]
A third example of the embodiment will be described with reference to FIG.

In this example, only the shape of the contact protrusion 33b provided on the axially inner side surface of the projecting portion 32 of the outer body portion 21 is changed from the structure of the first example of the embodiment.

That is, in this example as well, the contact protrusion 33b is composed of two radial protrusions 34a and 34b and two circumferential protrusions 35c and 35d. The width dimension of the direction convex portions 35c and 35d at the intermediate portions in the circumferential direction is different from that of the structure of the first example of the embodiment. In this example, by increasing the width dimension of the circumferential intermediate portions of the two circumferential protrusions 35c and 35d, the circumferential intermediate portions of the two circumferential protrusions 35c and 35d are connected in the radial direction. there is Therefore, only one non-contact portion 53a is formed inside the contact convex portion 33a. In other words, in this example, a rectangular convex portion having the same shape as the non-contact portion 53b of the structure of the first embodiment is newly formed at the position of the non-contact portion 53b.

In this example as described above, the contact area between the contact convex portion 33b and the radially inner half portion of the substrate portion 49b can be increased more than in the structure of the first example of the embodiment. Therefore, it is possible to more effectively prevent the surface pressure of the contact portion between the outer body portion 21 of the caliper body 3 and the outer pad 5 from locally increasing at the radially outer portion of the outer pad 5 .
Other configurations and effects are the same as those of the first embodiment.

Although the embodiment of the present invention has been described above, the present invention is not limited to this and can be modified as appropriate without departing from the technical idea of the invention. In addition, the structures of the respective examples of the embodiments can be implemented in combination as appropriate as long as there is no contradiction.

In the structure of each example of the embodiment, the case where the contact convex portion is composed of the radial direction convex portion and the circumferential direction convex portion has been described. It can be composed only of radial projections or only circumferential projections, or can be composed of projections having other shapes.

In the structure of each example of the embodiment, the structure having two cylinders in the inner body portion was shown, but when carrying out the present invention, the number of cylinders may be one or three or more. good.

Reference Signs List 1 disc brake device 2 support 3 caliper body 4 inner pad 5 outer pad 6a, 6b pad clip 7a, 7b pad clip 8 rotor 9 guide portion 10 inner side circumferential connecting portion 11 outer side circumferential connecting portion 12 mounting hole 13 inner guide portion 14 outer guide portion 15 caliper guide portion 16 inner guide groove 17 outer guide groove 18 support hole 19 slide pin 20 inner body portion 21 outer body portion 22a, 22b connecting member 23 cylinder 24 circumferential arm portion 25 radial extension Part 26 Fixing hole 27 Band-shaped rib 28 Axial direction cover part 29 Radial direction cover part 30 Wing part 31 Reference surface 32 Overhang part 33, 33a, 33b Contact convex part 34a, 34b, 34c Radial direction convex part 35a, 35b Circumferential direction Projection 36 Reinforcing rib 37 Relief recess 37a Deep recess 37b Shallow recess 38 Through hole 39 First recess 40 Second recess 41 Display 42 Groove 43 Mounting hole 44 Center window 45 Opening 46 Boot 47a, 47b Lining 48a , 48b back plate 49a, 49b substrate portion 50a, 50b ear portion 51 return spring 52 curl portion 53a to 53f non-contact portion 54 contact surface 100 outer body portion 100a pad pressing portion 101 outer pad

Claims (14)

an inner pad arranged axially inside the rotor;
an outer pad arranged axially outside the rotor;
a support that is fixed to the vehicle body and supports each of the inner pad and the outer pad so as to be axially movable;
a caliper body supported for axial movement with respect to the support;
The outer pad has a base plate supporting a lining and a back plate having ears,
The caliper body has a cylinder and has an inner body portion arranged axially inwardly of the rotor and an outer body portion that presses the outer pad during braking,
the outer body portion has a protruding portion protruding axially inward over substantially the entire portion axially facing the substrate portion;
The protruding portion has a portion axially facing the radially inner half portion of the substrate portion which is larger in area than the portion axially facing the radially outer half portion of the substrate portion. having an axially raised abutting convex portion with a larger area,
The outer body portion contacts only the tip surface of the contact protrusion with the axial outer side surface of the base plate portion during braking,
Floating type disc brake device. The outer body portion is recessed outward in the axial direction to allow the axially outer portions of the support to enter when the wear of the inner pad and the outer pad progresses. 2. A floating type disc brake device according to claim 1, having only one pair of relief recesses. The floating type disc brake device according to any one of claims 1 and 2, wherein the axial height of the contact protrusion is constant. The floating type disc brake device according to any one of claims 1 to 3, wherein said abutment projection has a strip-shaped radial projection extending in a radial direction. 5. The floating type disc brake device according to claim 4, wherein the radial protrusion is arranged on or near the central axis of the cylinder. A plurality of the radial projections are provided in a circumferential direction and are spaced apart from each other,
The plurality of radial protrusions are arranged parallel to each other,
A floating type disc brake device according to any one of claims 4 and 5. The protruding portion has a reinforcing rib on an outer peripheral edge portion of the axially inner side surface that is radially outwardly deviated from a portion axially facing the substrate portion,
a radially outer end of the radial projection is connected to the reinforcing rib;
A floating type disc brake device according to any one of claims 4 to 6. The floating type disc brake device according to any one of claims 1 to 7, wherein said abutment projection has a strip-shaped circumferential projection extending in the circumferential direction. The floating type disc brake device according to claim 8, wherein the circumferential projections are arranged so as to intersect with the radial projections. 10. The floating type disc brake device according to any one of claims 8 to 9, wherein a plurality of said circumferential projections are provided so as to be spaced apart from each other in the radial direction. The floating type disc brake device according to any one of claims 8 to 10, wherein the circumferential projection is arranged at a radial position that intersects the central axis of the cylinder. The floating type disc brake device according to any one of claims 8 to 10, wherein said circumferential projection is arranged at a position radially inwardly deviated from a central axis of said cylinder. The floating type disc brake device according to any one of claims 8 to 12, wherein the circumferential convex portion is curved so as to be convex radially outward. The floating type disc brake device according to any one of claims 1 to 13, wherein a circumferential dimension of said outer body portion is larger than a circumferential dimension of said support.

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